coma is the nebulous envelope around the nucleus of a comet, formed when the comet passes near the Sun in its highly elliptical orbit. As the comet warms...

first comet to be observed in detail by spacecraft, providing the first observational data on the structure of a comet nucleus and the mechanism of coma and...

The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently close and bright, a comet may...

already had an observable coma. A precovery image taken at the UK Schmidt Telescope in 1993 was found to show the then-unnoticed comet some 13 au from the Sun...

released from the comet nucleus into its coma. On 30 July 2015, scientists reported that the Philae spacecraft, that landed on comet 67P/Churyumov-Gerasimenko...

A comet tail and coma are visible features of a comet when they are illuminated by the Sun and may become visible from Earth when a comet passes through...

45 degrees north, the comet was visible all night in mid-July 2020. On July 30, Comet NEOWISE entered the constellation of Coma Berenices, below the bright...

comet to have an X-ray emission detected, which is most likely the result of ionised solar wind particles interacting with neutral atoms in the coma of...

characterise, a dynamically-new comet, including its surface composition, shape, structure, and the composition of its gas coma." Comet Interceptor is being developed...

the comet having a horseshoe shaped coma. It was probably created by the release of about 10 billion kilograms of dust and ice into space. The coma had...

Comet Kohoutek (formally designated C/1973 E1 and formerly as 1973 XII and 1973f) is a comet that passed close to the Sun towards the end of 1973. Early...

as stars appearing distorted, appearing to have a tail (coma) like a comet. Specifically, coma is defined as a variation in magnification over the entrance...

Earth, it displayed an apparent magnitude of 0, with an easily visible coma. The comet was discovered March 25, 1811 by Honoré Flaugergues at 2.7 AU from...

Like most comets, it has a very low albedo, reflecting only 4.6% of the light its nucleus receives, although comets generate a large coma and tail that...

An extinct comet is a comet that has expelled most of its volatile ice and has little left to form a tail and coma. In a dormant comet, rather than being...

known outburst by a comet, and became visible to the naked eye. It also briefly became the largest object in the Solar System, as its coma (the thin dissipating...

material that forms the comet's coma and tail. Unlike a long-period comet, the next perihelion passage of a numbered periodic comet can be predicted with...

32P/Comas Solà is a periodic comet with a current orbital period of 8.8 years. The comet nucleus is estimated to be 8.4 kilometers in diameter. 32P/Comas...

Astronomical Observatory, who examined a photograph that had been exposed for comet Comas Solà by Svetlana Ivanovna Gerasimenko on 11 September 1969 at the Alma-Ata...

brightness. Though the comet's coma had dimmed to magnitude 7.4 by 27 November, a tail spanning 10° remained visible to the naked eye. The comet dimmed below naked-eye...

Telescope in Namibia. The comet was found to be one magnitude brighter than predicted in their observations, with a slightly asymmetric coma up to 15 arcseconds...

arcminute. By 10 March 2024 the comet had brightened to a magnitude of 11.4 and the coma was 4 arcminutes across. The comet was observed visually on April...

very condensed coma. The comet was subsequently precovered in images obtained by other observatories back on 25 December 2022. The comet brightened in...

Comet ISON, formally known as C/2012 S1, was a sungrazing comet from the Oort cloud which was discovered on 21 September 2012 by Vitaly Nevsky (Віталь...

A.). He discovered the periodic comet 32P/Comas Solà, and co-discovered the non-periodic comet C/1925 F1 (Shajn-Comas Solà); he is also credited by the...

while K. Yoshimoto reported its coma was 15 arcseconds across and the comet had a small tail 25 arcseconds long. The comet was subsequently detected in images...

February 1999. Its primary mission was to collect dust samples from the coma of comet Wild 2, as well as samples of cosmic dust, and return them to Earth...

water and carbon dioxide molecules released from the comet nucleus into its coma. As the orbit of comet 67P took it farther from the Sun, the amount of sunlight...

a comet Coma (optics), the comatic aberration Coma Cluster, located in the constellation Coma Berenices Coma Star Cluster, in Coma Berenices Coma Supercluster...

changes in the comet's coma. From the photometric data obtained with OAO-2, the production rates of OH and H and their dependence on the comet's distance from...